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Users Sending to our Domain Recieve 4.4.7 Errors and Eventually Delivery Failure

I have been recieving reports from outside domains that they are occasionally recieving 4.4.7 errors when sending mail to our users.  The users report that the mail delivery does eventually fail.  I am using an external spam filter and I do not have any internal controls turned on to slow message delivery.  It was originally mostly happening from gmail users but it is spreading slowly.  The original user has a 5 GB mailbox because she acts as 4 people in the company.  I thought it may be related to this but it has surfaced with a few other users.  I also have another user with a 5 GB mailbox that has no issues.  I had posted this once before with the final error but recieved no input.  I am hoping this route helps as I am stumped.

Any help would be greatly appreciated!
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Michael Worsham
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I actually have extensive experience with the first three tools and we pass all the tests.  I had been wondering about the logging functions.  We had our outside spam filter check the Exchange SMTP interface and they cleared it.

Side note:  The message anecdote explains this situation perfectly.  I will let you know if this helps.
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Update to the scenario.  I have cleaned up our issues with DNS and ran extensive SMTP Diag's to configure.  We are now sending and recieving mail from all domains except one.  Our sister company, cannot send to us but we can send to them.  Coincidentally, I added two more domains to the Exchange server.  They were inherited from hosted mail solutions.  They can recieve from the sister company.  The only difference is the external spam filter companies are different for the 2 new domains, and the original domain.